Dark Dreams of Furiae - a new module for NWN:EE! Buy now
I'd love to hear some suggestions on this theme, both of things that simply "work" and things that are just really great.
It's not something I've put that much thought into before.
A few examples
Doom from a ranger or Jaheira (someone who wouldn't be focused on casting much) to prepare for a chromatic orb or similar save/die spell. Improved haste from mage onto fighter with a weapon that casts an effect, such as holy avenger (dispell) to maximise effectiveness.
As you can see, I don't have many examples so I'm really interested to see if there are some creative solutions out there.